Larry Page is rumored to be building a flying car, apparently dropping a whopping $100M into the effort. Surprisingly, this actually makes more sense to me than a self-driving car does, because it potentially solves two problems at once: You won't have to fly the thing yourself; and it eliminates the need for roads for those who commute to work. If we go to drone delivery and take into account advances in 3D printing for much of the stuff we use, then roads could become like railroad tracks -- just used for moving heavy stuff.